This standard applies to fixed inductors for suppressing radio frequency interference, which are used when connecting the entire machine and equipment to a power supply with a color ratio not exceeding 100 Hz. The nominal voltage between the lines of the power supply does not exceed 500V DC or AC (effective value), or the nominal voltage between any line and ground does not exceed 250 V DC or AC; Valid values). This standard also applies to assemblies composed of two or more inductors within a single housing. This standard is not fully applicable to inductors used in automobiles, airplanes, or ships. Additional requirements need to be specified in the detailed specifications for these applications. Inductors within the scope of this standard can also be used to protect the entire machine and equipment from electrical noise and voltage or current transients from power sources or other parts of the machine. When the inductor is not used for connecting to the power grid, the safety test specified in this specification is not applicable and can be omitted
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